Muffle-furnace for enameling.



0. ZAHN, MUFELB JREAGE FOR ENAMLING.

' APPLICATWN ULEB SEPT. 16, 191s.

1 2q: 3g@ v Patsnte Jan. 12, i915.

2 SHEETS-SHEET 2.

FZ; V /1 A y y? lz f ig im for firing enamel@ dee iameeunt imprese ehe cons lexe ha ee ih@ zu'ieles i23- grfate within mi e subjeeed to -f t," f1 A, sides, bcttom and Semper in Le er of the mue, As le con? Gf h iHe is heated bfi-fixe surimmdmg gasesq Dpef pari; of m amber be exl'emely thereof mdatn\ c ver of fthe heut gases only y u :1 s0 be eund necessary, when ennmenw (-erun goods, tha the @over 0 e e not only pro ele@ 5mm gases bui H sqmo @mime 'fhm,

protection t0i mui ze Chambley.

`io Fig. showing ime as required. cover Gf the mm3-'le pardjw heated, for' exemple at the side es 'he me upper pensi? er crown of he is protected from the external heut. method be empoyed in enses -v'heze 13.

the Whee @over mm would, owing to the thickness of fue ew resw: in too Qw a empeaure wie-Lin. mne,

En erde? ifi 1 clearly Ur part or romrime to if desuedi, the

tion through a mm'he chamber covered summg muerml. F151,

cooling space', and Fig.A 12 illustrates a slight nioditicution of t-hc furnace illustrated in Fig. l l.

` chambei` a, the articles to be fired or enameled receiving heat only from the sidewalls c and bottom c, While the heat rising in the chambei` a is absorbed by the furnace larch z.

1n order to prevent'any possibility of excessive heat in the upper part of the muilie chamber, owing to the heat being trapped or accumulating in the upper part of the side channels ce in Fig. 1, the side Walls maybe either insulated or increased in thickness at their bottom parts so as to reduce the heat conducted thereby or, if desired, the Walls e of the muille chamber may he inclined outwardlv and upwardly so as to attain the same efiect.

Fig. 2 illustrates a modification iii which the side Walls e are thickened 'at-their upper parts at 7/ so as to'reduce the heat conducted thereby at the upper part thereof. This arrangement has the further advantage that the side channels m are tapered toward their upper ends.

ln the'modihcation illustrated'in Fig. :all

the upper parts oi" the side walls e are protected by means of masonry furnace arch s,

ln the constructions`-illustrated in Figs and 5 the side walls e are inclined voutivardlv. the side walls e in Fig. 4 coinciding at their upper ends with the points from which the arch e springs. so thatthe sidev channels are correspondingly tapered iipn'ardiy resulting in a gradual diminution in the heat transmitted to the interior of the miilie chamber from the -bottom upwardly. ln the side ivalls sare still further outwardly inclined so that their upper ends are at a lower level than the springing points of the arch e. thus still further lowering the highest point from which heat is radiated. A l

'Fig (i illustrates a slight 'modication of the furnace illustrated in Figsl to 5 in which the furnace arch e instead of forming the cover 'for the wholeof the rouille chamber a forms only the cover of the rear part ot the muflic chamber ivhile the front part of. the rouille chamber is provided with al cover h forming a passage 712 over the front part of the mullle chamber a, the. passage b2 being 'formed between iont furnace arches el and e2 and the cover 2a and the rear urlw beneath theV nace arch z. It will be noted .that in this case vno dangerous effect ivill arise from heating the cover h owing tc the cooling aci tion through the door (not shoivn) at the front of the furnace. It will of course be understood that if desired, the gases may be allowed to pass over the cover h through the passage, b2 either wholly or in part or from time to time as required.

Instead of dispensing vi'ith the miiiiie cover as in Figs. 1 to 5. the m'ulile cover z' may be insulated by means of insulating material f as illustrated iii Fig. 7 so that little or no heat passes through the cover c' to the interior of the chamber a. If desired, however, the cover z', instead vof being insulated as in Fig. 7, may be correspondingly increased in thickness as illustrated in Fig. 8 and if required other parts of the mulie may be increased in thickness so as to reduce the amount of' heat penetrating the muie tothe interior upper-part thereof. For vthis purpose the side Walls e in Fig. 8 are shown enlarged attheir upper ends at e1, at the saine time serving as a'better heavy cover z'. w

As illustrated in Fig. 9 the cover i may, if desired. be provided with movable pro-l tecting plates 7c operated bytlmeans of rods Z support for the passing through to the outside. of the fur-1 nace and terminating in a suitable*handlemg4 .so that the heat conducted by' tliecov'er y may be regulated according to requiref of is protected by means" of insulating ma)- terial ,n from the Aexternal heat, thev .insulat-r ments It will be understood that in'this',

ing material n being inclosedin. 'verticalg5 walls o forming gas; passages p above. the"A side edges of the cover z.

` It is in many cases desirable, whenenameling, tocool the upper part of the inutile high articles which almost touch the cover of the muil'le chamber, and in this case, as illustrated in Fig. 1l, a cooling chamber g may be provided above the cover z', this coolfiiig chamber being separated from the furJ nace :c by means of horizontal partitions q.

ch-amber as, for example,'in'the case of very partitions r may be operated by means of rods s passing through the furnace vvalls and terminating in suitable handles t. TheY furnace gases may pass away, when the partitions 1' are in their closed position, through' sides of said .faufile reaching to he iop of@ i, ses

iuesv u provided With reguiaiiug valves o indicatedin drtted lines in Fig. 12.

. The hereinbefore described neeffie fue nuces consruced according to fue preseni, invention are exceiently suitable for enarneling work, no particular care being required on the part of. the Workman Whiie the yconsumption of fuel is comparativeiy small. The loss due to faulty firing is also considerably reduced. The special construction of the furnaces also results in longer life thereof. ,iN-lore especially is his the case with the furnaces construced ae cording to Fig-s,4 io 5 as The side Waiis e do nrt require to withstand the Weigii of ehe muie cover.

I ciaiinz- 1. in combination, a furnace chamber to which heaug gases are supplied and an inciosed mu'ii( so situated within said. chamber that. die gases can pass up at the sides of said inin'ie but not over he top thereof.

2. in combination, a furnace chamber 'izo which heating gases are supplied, and an inciosed niuiie. the top of said chamber forming he top of said muiiie.

3. In combination, furnace chamber to which keating gases are supplied and :in incioscd inuiie ciieiein Whose sides ex'send up to the top of said chamber.

4. A muiie furnace comprising a furnace chamber. und a muiiie in said chamber, the sides' of said muiie reaching to ehe iop of said chamber and forming side gas channels adapted io hea the upper part of said niuc io a iesser degree than the lower paris.

5. muiie Furnace coirurising e furnace chamber and a muiiie in id chamber5 ehe chamber, and means said chamber and having ytheir outer faces inclined ouu'ardiy and upwardly.

A muiiie furnace comprising a fur ace chamber and a mufieV in said chamberlihe sides of said mufe reaching to the A.op"of said chamber and being inclined outwardly andI upwardiy and of equal thickness hrougiiou'b. t Y

'2'. A muiiie furnace comprising a furnace chamber, a muiiie in said chamber, the sides of said muie reaching to the top of said chamber, and means for diminisi'iing the conducvion of heat at the upper ends of said sides.

S. A mufiie furnace comprising a furnace chamber, of said 'muie reaching to the top of said for protecting the up: per ends of said sides from the furnace gases. Y

9. A muiie chamber comprising a furnace chamber, and a mutiie Whose sides are in dined outwardly and bear at their opper ends against the sides of said bei',

l0. A muHe furnace comprising a fue nace chamber, a muiiie iusaid chamber, ine

yiront par of the sides ofvsaid vmufiie .reaching to the top of said chamber, and o, cover over the rear pari.I of said sides i. 1ring rf gas passage between said cover and le top of the furnace chamber.

In tes Arunny whereof have affixed my signature in presence ai two Wiinesses.

@Sl-KAR ZA' l. iii'tnesses iicaraLFmiDmcri Frisur/zee, Ammon? MLLER.

a muiie in said Chamber, the sides Jfurnace ciiam- 

